Effects of Altered Light and Feeding Regimes on the Zooplankton Feeding Capability of Hydra viridis

✍ Scribed by Dr. William S. Clayton Jr.

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 633 KB
• Volume: 69
• Category: Article
• ISSN: 1434-2944
• DOI: 10.1002/iroh.19840690503

✦ Synopsis

The effects of light regime, feeding regime and tentacle number on the zooplankton feeding capability of Hydra viridis were tested in the laboratory. Feeding was measured by exposing Hydra t o a known volume of Artemia salina nauplii and recording the number captured and ingested. I n all cases there was a correlation between the number of Artemia captured and the number ingested. H . viridis with 7 tentacles captured and ingested more Artemia than Hydro with 6 tentacles. However, changes in light and/or feeding regimes did not alter the number of tentacleslffydra. Varying light and feeding regimes altered the number of Zoochlorellae/cell and Hydra growth rate. There was no effect on the number of Artemia captured or ingested and no effect on the percent ingestion of captured Artemia. These data suggest that, under these conditions, zooplankton feeding by H . viridis is independent of nutritional history.